Often, Either is used to represent, exclusively, a value or a failure, in a
more detailed way than Maybe can. For example, a function like `parse` (
http://hackage.haskell.org/packages/archive/parsec/latest/doc/html/Text-Parsec-Prim.html#v:parse),
which is part of Parsec, might have a type like:
p
Hello
I'm new to Haskell, and need help with figuring out the Either type...
Any example to show how this works?
Jacob
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Welcome to issue 257 of the HWN, an issue covering crowd-sourced bits
of information about Haskell from around the web. This issue covers the
week of January 27 to February 02, 2013.
Quotes of the Week
* shachaf: Everyone forgets about Agda Lovelace, the first
constructivist.
* applic
I have also validated ghc 7.4.1 on the Ubuntu Precise distro booted on a
BeagleXM.
There's no ghci included.
--dude
On 02/06/2013 08:15 AM, kenny lu wrote:
I've got a Cubieboard a few weeks back. I started it off with Linaro
(Ubuntu) 12.06.
Today I started to upgrade the OS to 12.11, which su
On Wed, Feb 6, 2013 at 5:36 PM, Petr Pudlák wrote:
> Does anybody collect them or know about such a collection?
You can look at the Haskell Weekly News quote sections, or you can
download the lambdabot source repo and read the State/quote file.
--
gwern
http://www.gwern.net
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Dear haskellers,
over the time I've read many funny or inspiring quotes related to Haskell,
but I forgot them later. For example I vaguely remember:
- "What I really like about Haskell: It's completely unlike PHP."
- "To learn Haskell your brain will have to get seriously rewired."
Does anybod
You're right, somehow I didn't thought that DPH is doing exactly the same
thing. Well, I think
this is a convincing argument.
Janek
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> Would you object to this particular optimisation (replacing an algorithm
> with an entirely different one) if you were guaranteed that the space
> behaviour would not change?
No, I wouldn't.
Janek
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On Wed, Feb 6, 2013 at 6:45 AM, Jan Stolarek wrote:
> nevertheless I objected to his opinion, claiming that if compiler
> performed such a high-level
> optimization - replace underlying data structure with a different one and
> turn one algorithm into
> a completely different one - programmer wou
On Wed, Feb 6, 2013 at 1:18 PM, Austin Seipp wrote:
> Now, on a slight tangent, in practice, I guess it depends on your
> target market. C programs don't necessarily expose the details to make
> such rich optimizations possible. And Haskell programmers generally
> rely on optimizations to make ord
I've got a Cubieboard a few weeks back. I started it off with Linaro
(Ubuntu) 12.06.
Today I started to upgrade the OS to 12.11, which surprisingly came with
ghc 7.4.2.
And ghci magically works too.
Here are the links
http://www.cubieboard.org
sudo apt-get install update-manager-core
sudo apt-g
This is pretty much a core idea behind Data Parallel Haskell - it
transforms nested data parallel programs into flat ones. That's
crucial to actually making it perform well and is an algorithmic
change to your program. If you can reason about your program, and
perhaps have an effective cost model f
Ouch, forgot the Cafe.
Would you object to this particular optimisation (replacing an algorithm
with an entirely different one) if you were guaranteed that the space
behaviour would not change?
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http:
You don't reason about the bits churned out by a compiler but about the
actual code you write. If you want to preserve such information during
the compilation process, you probably want to run the compiler without
any optimization flags at all.
At the moment, with the way you are thinking about it
Hi all,
some time ago me and my friend had a discussion about optimizations performed
by GHC. We wrote a
bunch of nested list comprehensions that selected objects based on their
properties (e.g. finding
products with a price higher than 50). Then we rewrote our queries in a more
efficient for
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